I did not use IE (regularly; it was always there so that I could check out sites that wouldn't work otherwise) and I see no reason to use Edge. Firefox works, why bother with something else? More seriously, there are two features in Firefox that I find essential: (1) one can selectively erase cookies on browser exit, and (2) one can launch several instances of the browser with different profiles simultaneously.
Sky GO still doesn't work on it and I also optionally like the idea of a menu bar.
For me Firefox and the old IE are my browsers of choice.
Firefox for normal browsing and IE for watching SKY GO.
Edge won't be my regular one until it at least can support SKY GO.
SKY GO is an app for those who don't know it that makes SKY TV available for its customers on Phones / tablets / laptops so if you like say watching Premiership football (the game with the Round ball not the "squashed Rugby ball") while travelling with a laptop or are in a hotel without SKY TV then you can do so.
Sky Go tablet or laptop
Currently I use IE11 as primary and Chrome as secondary. Once extensions are available I will take another look at Edge. When I 1st tried Edge I wasn't impressed with it's functionality. However, I do believe if this is Microsoft's browser for the future, they will work toward getting it right.
I can't remember when I last used a Microsoft browser by choice, (It does get called by some processes automatically), and certain clients specify it's use so I'm not unaware of its abilities
I started on the net when Netscape was king, way before IE was even a twinkle in Bill Gate's eye, and have never found any compelling reason to use IE (and now Edge).
I've swapped between various alternative browsers as the viability changed over the years so it's not a case of using one product exclusively, just that in my experience Microsoft has never been the best for me
I believe Edge usage and satisfaction would be higher if Microsoft had automated importing favorites from IE as part of upgrading Windows 7/8.1. The icon for Edge is so similar to IE that many people don't realize it's a different browser; they're just upset that their favorites have disappeared. This is a big enough issue that sometimes people want to me to roll back to the previous OS, but they usually change their minds after I make a shortcut to IE and the favorites are restored.
IMHO I don't see Edge being the success that MS wants it to be. You only get one chance at a first impression and MS blew it by releasing Edge before it was ready.
Now, compared to other browsers, like Chrome, the extension market is far more mature, but now that extensions are available for Edge in preview, I'm sure most of the popular extensions will be ported (especially since they're basically the same as Chrome extensions).